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简介：为切入的流的隧道可变性的水力的几何学上的盆水文学的效果为Yazoo河盆用可得到的领域数据集合和分水岭水文学和隧道hydraulics的模型被调查，美国。学习用简单线性回归作为排水区域的功能在满满的分泌物介绍满满的分泌物，隧道宽度，吝啬的深度，代表性的区域，纵的斜坡，单位溪流力量，和吝啬的速度的水力的几何学关系。水力的几何学关系为61条溪流被开发，当隧道进化模型(CEM)打IV和V，他们中的41个是CEM溪流类型II和III，他们中的20个被分类。这些关系对无价水力并且水资源工程师，水文学者，和geomorphologists在溪流恢复和保护包含了。这些关系能被用来在一条溪流隧道的比较稳定性的未计量的分水岭以及评价在满满的舞台和溪流尺寸的地鉴定帮助。一套水力的几何学关系在这研究被介绍，这些实验关系为稳定、切入的隧道描述物理关联。代表性的区域，联合隧道宽度和吝啬的隧道深度的效果，被发现对在排水区域和满满的分泌物的变化高度应答。与在排水区域和满满的分泌物的变化一起的代表性的区域，隧道宽度，吝啬的隧道深度，和吝啬的速度的分析比是吝啬的隧道深度或吝啬的速度的显示隧道宽度对在排水区域和满满的分泌物的变化更应答。

简介：TheproblemofquickanalysisusingexactgeometrydatawasproposedbyHughesetal.andtheisogeometricanalysisframeworkwasintroducedasasolution.Inthisletter,theexactgeometryconceptiscombinedintothequasi-conformingframeworkandanovelmethod,i.e.,theexactgeometrybasedquasi-conforminganalysisisproposed.Inpresentmethodthegeometryisexactlydescribedbynon-uniformrationalB-splinebases,whilethesolutionspacebytraditionalpolynomialbases.Presentmethodcombinesthemeritsofbothisogeometricanalysisandquasi-conformingfiniteelementmethod.InthisletterEuler-Bernoullibeamproblemissolvedasanexampleandtheresultsshowthatthepresentmethodiseffectiveandpromising.

简介：Changesinrefractiveindexandthecorrespondingchangesinthecharacteristicsofanopticalwaveguideinenablingpropagationoflightarethebasisformanymodernsiliconphotonicdevices.Opticalpropertiesoftheseactivenanoscalewaveguidesaresensitivetothelittlechangesingeometry,externalinjection/biasing,anddopingprofiles,andcanbecrucialindesignandmanufacturingprocesses.Thispaperbringstheactivesiliconwaveguideforcompletecharacterizationofvariousdistinctiveguidingparameters,includingperturbationinrealandimaginaryrefractiveindex,modeloss,groupvelocitydispersion,andbendingloss,whichcanbeinstrumentalindevelopingoptimaldesignspecificationsforvariousapplication-centricactivesiliconwaveguides.

简介：与打漩的以前的研究比较流动，在螺线嘴产生的螺线流动有一些不同流动特征。产生它的速度不需要强迫的正切的动量并且从象长潜在的核心和低正切的速度那样的打漩的流动有一些不同优点。在这研究，在螺线嘴的流动特征上的嘴几何学的效果被实验和计算调查。作为结果，实验获得的流动特征与计算结果，份量上和品质上有一个令人满意的协议。

简介：Step-edge-inducednucleationplaysakeyroleincontrollingthegrowthofnovelnanostructuresandlow-dimensionalmaterials.However,itisdifficulttoexperimentallydeterminethestepedgestructuresofcomplexmetaloxides.Inthiswork,wepresentadetailedtheoreticalstudyofthestabilityofstoichiometTicstepsonsapphire(OOOl).Basedonfirst-principlescalculationsandexcesschargecomputationbyFinnis1approach,apairofnon-polarstepedgesaredeterminedtobethemoststable.BystudyingtheadsorptioncharacteristicsofZnOandcombiningpreviousworks,wesuccessfullyexplainedhowgrowthtemperatureanddepositionrateaffectthein-planeorientationofZnOgrownonsapphire(OOOl).Theknowledgeonthestepedgestructuresandnucleationpatternswouldbenefitthestudyonstep-edge-guidednanostructuregrowth.

简介：这份报纸论述对流动结构和热的隧道几何学的影响的学习转，并且也，他们一个光线的冷却段落的所有墙上的关联煤气的汽轮机片当模特儿。调查在隧道集中于热转移和空气动力学的大小，它是在飞机引擎使用的配置的一个精确代表。为热转移系数和在内部冷却段落的设计使用的压力落下的关联经常从简化模型被开发。一个角落切，对真实引擎段落没有完美的矩形的生气的节的笔记重要，但是包括，肋骨与切半径和特殊取向。因此，这个工作为有很现实主义的特征的光线的冷却几何学的一个模型提供详细液体流动和热转移数据。

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简介：Dependentonautomaticallygeneratedunstructuredgrids,acomprehensivecomputationalfluiddynamics(CFD)numericalsimulationisperformedtoanalyzetheinfluenceofnozzlegeometryontheinternalflowcharacteristicsofamulti-holedieselinjectorwiththemulti-phaseflowmodelbasedonEulerianmulti-fluidmethod.Thedieselcomponentsinnozzleareconsideredastwocontinuousphases,dieselliquidanddieselvaporrespectively.Consideringthatbothofthemarefullycoupledandinterpenetrated,sepa...

简介：在这篇文章，我们与时间依赖者dissipation2gijt2+(1+t)调查夸张几何学流动gijt=-2Rij，在Riemann上表面。根据精力方法，为0<1，>+1，我们证明那在那里存在全球答案gij到有有asymptotic的时间依赖者驱散的夸张几何学流动完全起始的Riemann表面。而且，我们证明分级的弯曲R(t，x)答案度量标准gij遗体一致地跳了。

简介：Wedemonstratehowametalwiregratingcanworkasa45°polarizationconverter,aquarter-waveretarder,andahalf-waveretarderoverabroadbandterahertzrangewhensetupintotalinternalreflectiongeometry.Classicalelectromagnetictheoryisappliedtounderstandthemechanism,andequationstocalculatethepolarizationstateofreflectedlightarederived.Weuseametalgratingwithaperiodof20μmandwidthof10μmonafusedsilicasurface:linearlypolarizedterahertzlightincidentfromfusedsilicawithasupercriticalincidentangleof52°istotallyreflectedbythemetalgratingandair.Thepolarizationoftheterahertzlightisrotatedby45°,90°,andcircularlypolarizedbysimplyrotatingthewiregrating.Theperformanceisachromaticoverthemeasuredrangeof0.1–0.7THzandcomparabletocommercialvisiblelightwaveretarders.

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简介：Westudytheconsistencyconditionsofthegeneralizedf(R)gravitybyextendingf(R)gravitywithnon-minimalcouplingtothegeneralizedf(R)witharbitrarygeometry-mattercoupling.Specifically,wediscussthetwoparticularmodelsofgeneralizedf(R)bymeansofconsistencyconditions.Itisfoundthatthesecondmodelisnotphysicallyviablesoastoberuledout.Moreover,wefurtherconstrainthefirstmodelusingtheDolgovKawasakistabilitycriterion,andgivethevaluerangesoftheparametersinthefirstmodel.Itisworthstressingthatourresultsincludetheonesinf(R)gravitywithnon-minimalcouplingasthespecialcaseofQ(L_m)=L_m.

简介：Experimentsarereportedontheeffectsofflowintensity,obstaclealignmentandcross-sectiongeometryontheequilibriumscourdeptharoundabutments.Theeffectofflowintensitywasstudiedforclearwaterflowconditions,theobstaclealignmentwasstudiedforawiderangeofanglesoftheobstaclewiththeflowdirection,andtestsonthecross-sectiongeometryapplyonlytothecasewheretheabutmentextendsintothemainchannelofacompoundcross-section(two-stagechannel).Thechannelbankandfloodplainwerebuiltupwithsand.Thehypothesisofzeroscourforflowvelocitiessmallerthanapproximately50%ofthethresholdvelocityforthebeginningofmotionintheapproachingflowcannotberejected;maximumscouroccursforobstaclesprotrudingatrightanglefromthecross-sectionwalls,thereductionbeingsmallwhenobstaclespointupstream;comparedwithrigidbanks,thescourdepthseemstobesignificantlyreducedwhenchannelbankandfloodplainareconstitutedofalluvialmaterial.

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简介：Weemployedametallicwiregratingloadedwithgrapheneandoperatingintotalinternalreflection(TIR)geometrytorealizedeepandbroadbandTHzmodulation.Thenon-resonantfieldenhancementeffectoftheevanescentwaveinTIRgeometryandinthesubwavelengthwiregratingwascombinedtodemonstratea-77%modulationdepth(MD)inthefrequencyrangeof0.2–1.4THz.ThisMD,achievedelectricallywithaSiO2∕Sigatedgraphenedevice,was4.5timeshigherthanthatofthedevicewithoutametalgratingintransmissiongeometry.Byoptimizingtheparametersofthemetallicwiregrating,therequiredsheetconductivityofgraphenefordeepmodulationwasloweredto0.87mS.ThisworkhaspotentialapplicationsinTHzcommunicationandreal-timeTHzimaging.

简介：Thefinite-differencetime-domainmethodwasemployedtocalculatelightextractionefficiencyofthin-filmflip-chipInGaN/GaNquantumwelllight-emittingdiodes（LEDs）withTiO2microspherearrays.TheextractionefficiencyforLEDswithmicrospherearrayswasinvestigatedbyfocusingontheeffectofthepackingdensity,packingconfiguration,anddiameter-to-periodratio.Thecomparisonstudiesrevealedtheimportanceofhavingahexagonalandclose-packedmonolayermicrospherearrayconfigurationforachievingoptimumextractionefficiency,whichtranslatedintoa3.6-foldenhancementinlightextractioncomparedtothatforaplanarLED.ThisimprovementisattributedtothereducedFresnelreflectionandenlargedlightescapecone.Theengineeringofthefar-fieldradiationpatternswasalsodemonstratedbytuningthepackingdensityandpackingconfigurationofthemicrospherearrays.

简介：Wedescribeafewmathematicaltoolswhichallowtoinvestigatewhetherair-waterinterfacesexist(underprescribedconditions)andaremechanicallystableandtemporallypersistent.Intermsofphysics,air-waterinterfacesaregovernedbytheYoung-Laplaceequation.Mathematicallytheyaresurfacesofconstantmeancurvaturewhichrepresentsolutionsofanonlinearellipticpartialdifferentialequation.Althoughexplicitsolutionsofthisequationcanbeobtainedonlyinveryspecialcases,itis-undermoderatelyspecialcircumstances-possibletoestablishtheexistenceofasolutionwithoutactuallysolvingthedifferentialequation.Wealsoderivecriteriaformechanicalstabilityandtemporalpersistenceofanairlayer.Furthermorewecalculatethelifetimeofanon-persistentairlayer.Finally,weapplythesetoolstotwoexampleswhichexhibitthesymmetriesof2Dlattices.TheseexamplescanbeviewedasabstractionsofthebiologicalmodelrepresentedbytheaquaticfernSalvinia.

简介：为了在无线传感器网络(WSN)完成安全通讯，在有有限计算能力的传感器节点随机在敌对领土上被散布的地方，各种各样的关键分发前策划(KPS)被建议了。在这份报纸，新KPS在有限的地上基于symplectic几何学被建议。在一个symplectic空格的固定维的subspace代表一个节点，所有1-dimensionalsubspaces表示钥匙和每个节点分享了钥匙。但是这天真的印射不保证一个好网络得到跳回。因此，它被建议二个节点不得不计算一把pairwise钥匙的提高的KPS，仅当他们分享至少q普通钥匙。这条途径对节点俘获攻击提高跳回。与解决方案的存在相比，结果证明那条新途径更加提高网络可伸缩性，并且完成好连接和好全面性能。

简介：Interactivepickingisafundamentaltaskforprocessingdigitalgraphicsandimages.Combiningtwo-dimensional(2D)andthree-dimensional(3D)viewsisanimportanttrendinprocessingmedicalsliced-geometries.Withthegoalofaccuratelypickingpointsinsliced-geometries,wepresentamethodtopickpointsinteractivelybycombining2Dand3Dviewsofsliced-geometries.Fourviewwindowsareconstructedtorendersliced-geometriesusingmedicalimaginginteractiontoolkit(MITK):threefor2DslicesparalleltotheXY,YZ,andXZplanesandoneforsurfacerendering.Pointspickedinaviewwindowcanberenderedandmodifiedinanywindow.Afterapointispicked,itisimmediatelyconvertedintoaworldcoordinateandstored.Pointsareonlyrenderedandmodifiedbasedontheirworldcoordinates.Thispickingmethodcanbeusedforfitting,observing,andmeasuringlocalregions.Thismethodcanalsobeusedforinteractivesegments.Ourexperimentshowsthatthepickingmethodisaccurateandhasareal-timepickingeffect.